GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2151705 Date: 31/05/2019Subject Name: Process Control Systems
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define dead time in process control. Explain its effect on system stability. 03
(b) What causes inverse response? Explain with mathematical arguments. 04
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(c) Derive the transfer function of non interacting two tank system with linear resistance element. 07Q.2 (a) With the help of suitable example, explain servo and regulatory control system. 03
(b) Explain any one method for obtaining First Order Plus Time Delay (FOPTD) approximate model for processes. 04
(c) Derive the mathematical model of continuous stirred tank heater with its process loop. 07
OR
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(c) Discuss two position control with and without neutral zone. What is the effect of neutral zone on controller output? 07
Q.3 (a) Explain direct and reverse mode of control action with the help of example. 03
(b) Explain multi position control in brief. 04
(c) Analyze the closed loop response of first order system with proportional control to unit step change in set point and unit step change in process load. 07
OR
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Q.3 (a) An integral controller is used for speed control with a set point of 12 rpm within a range of 10-15 rpm. Initially, at zero error the controller output is 22%. The constant
Ki = -0.15% controller output per second per percentage error. If the speed jumps to 13.5 rpm, calculate the controller output after 2 seconds for a constant ep. 03
(b) What is offset in case of proportional control action? How offset can be eliminated? Explain. 04
(c) Explain the composite PI controller with equation, transfer function and draw the response of PI controller to step input of error. 07
Q.4 (a) What is self regulation? Give an example of self regulating process. 03
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(b) Briefly discuss velocity form of discrete PID controller. Also state its advantages over position form of the algorithm. 04(c) Explain Integral wind up and anti-wind up scheme to prevent it. 07
OR
Q.4 (a) Draw and explain unit step response of an integrating process. 03
(b) Briefly discuss position form of discrete PID controller. Also discuss its limitations. 04
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(c) What do you mean by tuning of controller? Explain Z-N method of tuning. 07Q.5 (a) Show any one configuration of ratio control scheme. 03
(b) Briefly discuss override control scheme. 04
(c) Draw the basic block diagram of feed forward control. Write the difference between feedback and feed forward control scheme. 07
OR
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Q.5 (a) Briefly explain air-fuel ratio control for drum boiler. 03
(b) Briefly explain the split range control scheme. 04
(c) Draw the basic block diagram of cascade control scheme and discuss in detail with suitable process example. 07
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